BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Christopher Halcrow (Leeds) DTSTART:20200811T160000Z DTEND:20200811T170000Z DTSTAMP:20260423T011056Z UID:QMFNoT/13 DESCRIPTION:Title: Nuclei as Skyrmions\nby Christopher Halcrow (Leeds) as part of QM Foun dations & Nature of Time seminar\n\n\nAbstract\nIn standard models of nucl ear physics\, nuclei are described as point particles with spin and isospi n degrees of freedom. The baryon number (the number of protons plus the nu mber of neutrons) is conserved in nuclear interactions - this fact is usua lly put in “by hand”. In contrast\, the Skyrme model describes nuclei as topological solitons. The baryon number is conserved due to a topologic al invariant of the theory while spin and isospin appear as quantised isom etries of the system. This talk is in two parts: first\, I will try and co nvince you that the Skyrme model is a reasonable model of nuclear physics. It reproduces several known phenomena: nuclear clustering\, isospin symme try and rotational bands in energy spectra. I will then show that the Skyr me model is very different than standard nuclear models: the notion of pos ition breaks down\, the Deuteron is a torus and novel scatterings can take place. These surprising facts can give new explanations for some nuclear properties. For instance\, the existence of a toroidal Skyrmion explains t he attractive spin-orbit force in the nucleon-nucleon interaction as shown recently in arXiv:2007.01304. I will explain this phenomena assuming no b ackground knowledge of Skyrmions or nuclear physics.\n LOCATION:https://researchseminars.org/talk/QMFNoT/13/ END:VEVENT END:VCALENDAR